Park the car indoors of put a car cover over it. Even uncovered outdoors, I really don't think you'll have any problems with rust.
That said, one idea may be plastidip. You can spray it on, and when your ready to drive again, it can be pealed right back off without any residue leftover.
Hatch Nation #13 : Rally Revolution #13 : ROTM Jan '13
It's Bryan, not Brian
RSVT-170 Build in Progress
Rusty is dead